/Engine/Source/Runtime/Engine/Public/ExternalPackageHelper.h
Get the saveable external objects that should be saved alongside this outer's package
static void GetExternalSaveableObjects ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * InOuter, [TArray](API\Runtime\Core\Containers\TArray)< [UObject](API\Runtime\CoreUObject\UObject\UObject) * > & OutObjects )